Refactored codebase

[Achal1607]

The main aim of refactoring was to make code more modular so that it is more readable, scalable and maintainable.

• extension.ts is refactored into multiple modules
• LSP server startup is simplified
• commands and configuration modules are created
• Debugger is separated out in a different module
• Logger and other utils files are created.

NOTE: Views are yet to be refactored which can be done in a separate PR or included in this only once it is done.

[naren2605]

thanks for taking up this and refactoring @Achal1607 , its a big change. code looks more organised now